Search results for "Mineral deposit"
showing 3 items of 3 documents
Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP
2020
Abstract The biogas produced in municipal wastewater-treatment plants (WWTP) should be cleaned before it can be used as a fuel in internal combustion engines. Efficient running of such engines is possible only subject to using high quality biogas and lubricating oil. Otherwise, biogas impurities in course of complex chemical reactions may form deposits on various engine parts as well as seriously contaminate the lubricating oil. In this paper, mineral deposits containing high concentration of bismuth, silicon, sulphur, calcium and zinc are studied. Silicon deposits demonstrating strong friction properties are formed during combustion of volatile silica compounds. As these deposits build up,…
Mollusc shellomes: Past, present and future.
2020
13 pages; International audience; In molluscs, the shell fabrication requires a large array of secreted macromolecules including proteins and polysaccharides. Some of them are occluded in the shell during mineralization process and constitute the shell repertoire. The protein moieties, also called shell proteomes or, more simply, 'shellomes', are nowadays analyzed via high-throughput approaches. These latter, applied so far on about thirty genera, have evidenced the huge diversity of shellomes from model to model. They also pinpoint the recurrent presence of functional domains of diverse natures. Shell proteins are not only involved in guiding the mineral deposition, but also in enzymatic a…
Devona Daugavas svītas dolomītu litoloģiski rūpnieciskie tipi atradnēs Rīgas apkārtnē
2020
Bakalaura darbā “Devona Daugavas svītas litoloģiski rūpnieciskie tipi atradnēs Rīgas apkārtnē” ir raksturota Daugavas svītas dolomītu uzbūve ģeoloģiskajā griezumā, dolomītu veidu izplatības likumsakarības 5 dolomīta atradnēs Rīgas apkārtnē un Doles salas dolomīta atsegumā, kā arī nodalīti dolomītu litoloģiski rūpnieciskie tipi. Pētījuma ietvaros veikti lauka darbi, kuros veikta atseguma sienu dokumentācija. Pētījuma rezultātā secināts, ka 1. tipa ļoti izturīgie un 2. tipa izturīgie dolomīti ir visplašāk pārstāvēti Tūrkalnes, Kranciema un Kalnciema atradnēs.